• Assays received for 21 RC holes at Side Well South, highlighting wide, high-grade mineralisation
• Side Well South is close to the definition of an initial Mineral Resource Estimate (MRE)
• Field exploration at the broader Side Well Project continues to accelerate

Great Boulder Resources ('Great Boulder' or the 'Company') (ASX: GBR) is pleased to provide an update on progress at the Company's flagship Side Well Gold Project ('Side Well') near Meekatharra in Western Australia which hosts a MRE of 668,000oz @ 2.8 g/t Au. Assays received for 21 RC holes recently drilled at the Side Well South prospect have highlighted further wide, high-grade mineralisation from shallow depths. Significant results include 21m @ 2.22g/t Au from 41m, 24m @ 2.75g/t Au from 97m, and 8m @ 3.88g/t Au from 144m. Side Well South is close to the definition of an initial Mineral Resource Estimate (MRE) with only a small number of additional holes required. Field exploration at the broader Side Well Project continues to accelerate, with one diamond and two RC rigs currently drilling priority targets. The Company is on schedule for its pending resource update, which will include five deposits: Mulga Bill, Eaglehawk, Ironbark, Saltbush and Side Well South.

The GBR exploration team are finishing off the last few RC holes at Eaglehawk and Side Well South before finalising the geological and mineralisation interpretations in readiness for resource estimation. The Company is also waiting on assays from the last round of RC drilling at Ironbark. Planning is underway for a program of deep holes to test for depth extensions under the Mulga Bill - Eaglehawk intrusive-related gold system during Q4 2025.